Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill and other intangible assets

Goodwill, customer relationships and other intangible assets consisted of the following:

	As of December 31,
	2017		2016
	(Dollars in millions)
Goodwill	$	30,475	19,650
Customer relationships, less accumulated amortization of $7,096 and $6,318	$	10,876	2,797
Indefinite-life intangible assets	$	269	269
Other intangible assets subject to amortization:
Capitalized software, less accumulated amortization of $2,294 and $2,019	1,469		1,227
Trade names and patents, less accumulated amortization of $31 and $23	159		35
Total other intangible assets, net	$	1,897	1,531

Schedule of estimated amortization expense for intangible assets

We estimate that total amortization expense for intangible assets (which include preliminary estimates for the intangible assets acquired from Level 3) for the years ending December 31, 2018 through 2022 will be as follows:

	(Dollars in millions)
2018	$	1,802
2019	1,701
2020	1,590
2021	1,149
2022	977

Schedule of goodwill attributable to segments

The following table shows the rollforward of goodwill assigned to our reportable segments from December 31, 2015 through December 31, 2017.

	Business			Consumer	Total
	(Dollars in millions)
As of December 31, 2015(1)	$	10,464		10,278	20,742
Purchase accounting and other adjustments	49			—	49
Goodwill attributable to the colocation business and data centers reclassified to assets held for sale	(1,141		)	—	(1,141	)
As of December 31, 2016(1)	9,372			10,278	19,650
Purchase accounting and other adjustments	10,825			—	10,825
As of December 31, 2017(1)	$	20,197		10,278	30,475

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⁽¹⁾ Goodwill is net of accumulated impairment losses of $1.1 billion that related to our former hosting segment now included in our business segment.